/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/PolygonFunctions.h
Returns the vertices of a Polygon  either of the outer polygon, if HoleIndex is -1, or specified inner hole. OutVertices will be empty for invalid Polygon or Hole indices.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="GeometryScript|PolygonList", Meta=(ScriptMethod)) static void GetPolygonVertices ( [FGeometryScriptGeneralPolygonList](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptG-) PolygonList, [TArray](API\Runtime\Core\Containers\TArray)< FVector2D > & OutVertices, bool & bValidIndices, int32 PolygonIndex, int32 HoleIndex )